/**
 * дʱ�������� copy on write
 * ���̻߳����£�дʱЧ�ʵͣ���ʱЧ�ʸ�
 * �ʺ�д�ٶ���Ļ���
 *
 * @author ��ʿ��
 */
package com.mashibing.juc.c_025;

import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;
import java.util.Random;
import java.util.Vector;
import java.util.concurrent.CopyOnWriteArrayList;

public class T02_CopyOnWriteList {
    public static void main(String[] args) {
        List<String> lists =
                //new ArrayList<>(); //�������������⣡
                //new Vector();
                new CopyOnWriteArrayList<>();
        Random r = new Random();
        Thread[] ths = new Thread[100];

        for (int i = 0; i < ths.length; i++) {
            Runnable task = new Runnable() {

                @Override
                public void run() {
                    for (int i = 0; i < 1000; i++) lists.add("a" + r.nextInt(10000));
                }

            };
            ths[i] = new Thread(task);
        }


        runAndComputeTime(ths);

        System.out.println(lists.size());
    }

    static void runAndComputeTime(Thread[] ths) {
        long s1 = System.currentTimeMillis();
        Arrays.asList(ths).forEach(t -> t.start());
        Arrays.asList(ths).forEach(t -> {
            try {
                t.join();
            } catch (InterruptedException e) {
                e.printStackTrace();
            }
        });
        long s2 = System.currentTimeMillis();
        System.out.println(s2 - s1);

    }
}

